---
title: "Discussion on \"Lesson 4: 效能殺手與救星-Index 索引的原理、複合索引與 Explain 分析\" | Hashnode"
description: "Discussion on \"Lesson 4: 效能殺手與救星-Index 索引的原理、複合索引與 Explain 分析\". 查詢速度慢？你需要的是 Index 索引優化！深入解析 B-Tree 索引原理、複合索引 (Composite Index) 的最左前綴原則。學會使用 Explain 指令分析 SQL 執行計畫，找出效能殺手並精準優化資料庫查詢速度。"
url: "https://hashnode.com/posts/lesson-4-index-explain/693a88d3b83af1e653dd2428"
---

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# [Lesson 4: 效能殺手與救星-Index 索引的原理、複合索引與 Explain 分析](https://blog.bennett1999.com/lesson-4-index-explain?utm_source=hashnode&utm_medium=feed)

查詢速度慢？你需要的是 Index 索引優化！深入解析 B-Tree 索引原理、複合索引 (Composite Index) 的最左前綴原則。學會使用 Explain 指令分析 SQL 執行計畫，找出效能殺手並精準優化資料庫查詢速度。

Dec 5, 2025 · 6 min read · blog.bennett1999.com  
Updated Apr 29  
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## Written by

[Bennett](https://hashnode.com/@bennett1999)

@bennett1999 · Taipei

  
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A good programmer is someone who always looks both ways before crossing a one-way street

一個很忙的工程師，比起寫code更喜歡股票，QQQ買起來，謝謝！

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